Buna!, this example loads a "Large Banner" with size 320x100.
https://developers.google.com/mobile-ads-sdk/docs/admob/android/banner
that loads every 60 secs.
https://apps.admob.com/#monetize

Must have referenced appcompat_v7 and google-play-services libraries.

* Don´t forget to add your banner  AD UNIT ID into the strings.xml whose format must be:
ca-app-pub-xxxxxxxxxxxxxxx/xxxxxxxxxx

any question write to jorgesys12@gmail.com

pa!